Lost password on Mac OSX 10.4.11

Question

In Fact, my ex wife left This machine here, but she forgot the Password... So i can't use it :( . I bought Mac OSX Leopard to use it again... But when i had insert the CD, the Mac asked me again the Password!!! Should i go to Apple Center?? Or You have an easy Solution that i could follow? Thanks for help. Pierre

Answer 1

It sounds like a Firmware Password. You need to turn the computer off and unplug it from the wall outlet. Remove both memory modules. Wait about five minutes, then reinstall them. That should remove the Firmware Password.
However, there will also be a user account password you will need for full usage of the computer, but your ex should know that password. If she doesn't then see further:
Forgot Your Account Password
For Lion/Mountain Lion
    Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
     When the menubar appears select Terminal from the Utilities menu.
     Enter resetpassword at the prompt and press RETURN. Follow
     instructions in the dialog window that will appear.
     Or see Reset a Mac OS X 10.7 Lion Password, OS X Mountain Lion- Reset a login password, and
     OS X Lion- Apple ID can be used to reset your user account password.
For Snow Leopard and earlier with installer DVD
     Mac OS X 10.6- If you forget your administrator password
For Snow Leopard and earlier without installer DVD
    How to reset your Mac OS X password without an installer disc | MacYourself